fs/udf/ialloc.c

   1 /*
   2  * ialloc.c
   3  *
   4  * PURPOSE
   5  *      Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2001 Ben Fennema
  14  *
  15  * HISTORY
  16  *
  17  *  02/24/99 blf  Created.
  18  *
  19  */
  20
  21 #include "udfdecl.h"
  22 #include <linux/fs.h>
  23 #include <linux/quotaops.h>
  24 #include <linux/udf_fs.h>
  25 #include <linux/sched.h>
  26 #include <linux/slab.h>
  27
  28 #include "udf_i.h"
  29 #include "udf_sb.h"
  30
  31 void udf_free_inode(struct inode *inode)
  32 {
  33         struct super_block *sb = inode->i_sb;
  34         struct udf_sb_info *sbi = UDF_SB(sb);
  35
  36         /*
  37          * Note: we must free any quota before locking the superblock,
  38          * as writing the quota to disk may need the lock as well.
  39          */
  40         DQUOT_FREE_INODE(inode);
  41         DQUOT_DROP(inode);
  42
  43         clear_inode(inode);
  44
  45         mutex_lock(&sbi->s_alloc_mutex);
  46         if (sbi->s_lvidbh) {
  47                 if (S_ISDIR(inode->i_mode))
  48                         UDF_SB_LVIDIU(sb)->numDirs =
  49                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
  50                 else
  51                         UDF_SB_LVIDIU(sb)->numFiles =
  52                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
  53
  54                 mark_buffer_dirty(sbi->s_lvidbh);
  55         }
  56         mutex_unlock(&sbi->s_alloc_mutex);
  57
  58         udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
  59 }
  60
  61 struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
  62 {
  63         struct super_block *sb = dir->i_sb;
  64         struct udf_sb_info *sbi = UDF_SB(sb);
  65         struct inode *inode;
  66         int block;
  67         uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
  68
  69         inode = new_inode(sb);
  70
  71         if (!inode) {
  72                 *err = -ENOMEM;
  73                 return NULL;
  74         }
  75         *err = -ENOSPC;
  76
  77         UDF_I_UNIQUE(inode) = 0;
  78         UDF_I_LENEXTENTS(inode) = 0;
  79         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
  80         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
  81         UDF_I_STRAT4096(inode) = 0;
  82
  83         block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
  84                               start, err);
  85         if (*err) {
  86                 iput(inode);
  87                 return NULL;
  88         }
  89
  90         mutex_lock(&sbi->s_alloc_mutex);
  91         if (UDF_SB_LVIDBH(sb)) {
  92                 struct logicalVolHeaderDesc *lvhd;
  93                 uint64_t uniqueID;
  94                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
  95                 if (S_ISDIR(mode))
  96                         UDF_SB_LVIDIU(sb)->numDirs =
  97                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
  98                 else
  99                         UDF_SB_LVIDIU(sb)->numFiles =
 100                                 cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
 101                 UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
 102                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
 103                         uniqueID += 16;
 104                 lvhd->uniqueID = cpu_to_le64(uniqueID);
 105                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
 106         }
 107         inode->i_mode = mode;
 108         inode->i_uid = current->fsuid;
 109         if (dir->i_mode & S_ISGID) {
 110                 inode->i_gid = dir->i_gid;
 111                 if (S_ISDIR(mode))
 112                         mode |= S_ISGID;
 113         } else {
 114                 inode->i_gid = current->fsgid;
 115         }
 116
 117         UDF_I_LOCATION(inode).logicalBlockNum = block;
 118         UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 119         inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
 120         inode->i_blocks = 0;
 121         UDF_I_LENEATTR(inode) = 0;
 122         UDF_I_LENALLOC(inode) = 0;
 123         UDF_I_USE(inode) = 0;
 124         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
 125                 UDF_I_EFE(inode) = 1;
 126                 UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
 127                 UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
 128         } else {
 129                 UDF_I_EFE(inode) = 0;
 130                 UDF_I_DATA(inode) = kzalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
 131         }
 132         if (!UDF_I_DATA(inode)) {
 133                 iput(inode);
 134                 *err = -ENOMEM;
 135                 mutex_unlock(&sbi->s_alloc_mutex);
 136                 return NULL;
 137         }
 138         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
 139                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 140         else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 141                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 142         else
 143                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 144         inode->i_mtime = inode->i_atime = inode->i_ctime =
 145                 UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
 146         insert_inode_hash(inode);
 147         mark_inode_dirty(inode);
 148         mutex_unlock(&sbi->s_alloc_mutex);
 149
 150         if (DQUOT_ALLOC_INODE(inode)) {
 151                 DQUOT_DROP(inode);
 152                 inode->i_flags |= S_NOQUOTA;
 153                 inode->i_nlink = 0;
 154                 iput(inode);
 155                 *err = -EDQUOT;
 156                 return NULL;
 157         }
 158
 159         *err = 0;
 160         return inode;
 161 }